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/*
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 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
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 *   http://www.apache.org/licenses/LICENSE-2.0
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 * Unless required by applicable law or agreed to in writing,
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 * under the License.
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 * This software consists of voluntary contributions made by many
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package org.apache.http.protocol;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.apache.http.annotation.ThreadingBehavior;
import org.apache.http.annotation.Contract;
import org.apache.http.util.Args;

/**
 * Default implementation of {@link HttpContext}.
 * 

* Please note instances of this class can be thread unsafe if the * parent context is not thread safe. * * @since 4.0 */ @Contract(threading = ThreadingBehavior.SAFE_CONDITIONAL) public class BasicHttpContext implements HttpContext { private final HttpContext parentContext; private final Map map; public BasicHttpContext() { this(null); } public BasicHttpContext(final HttpContext parentContext) { super(); this.map = new ConcurrentHashMap(); this.parentContext = parentContext; } @Override public Object getAttribute(final String id) { Args.notNull(id, "Id"); Object obj = this.map.get(id); if (obj == null && this.parentContext != null) { obj = this.parentContext.getAttribute(id); } return obj; } @Override public void setAttribute(final String id, final Object obj) { Args.notNull(id, "Id"); if (obj != null) { this.map.put(id, obj); } else { this.map.remove(id); } } @Override public Object removeAttribute(final String id) { Args.notNull(id, "Id"); return this.map.remove(id); } /** * @since 4.2 */ public void clear() { this.map.clear(); } @Override public String toString() { return this.map.toString(); } }





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